| abstract |
(57) [Summary] [Structure] Once in the high temperature heat exchanger 11 (200 ° C or higher), Cool to 200 ° C., then cool the low temperature heat exchanger 10 (200 Further cooling (below ℃). In order to reduce the power consumption used for the regeneration gas, heat is exchanged with the waste gas coming out of the catalyst tank 4. [Effects] An economical process can be achieved by dividing the heat exchange into aluminum 10 and stainless steel 11 as in the first embodiment, rather than using only stainless steel in the conventional heat exchange. The power consumption of the regenerative heater 12 can be reduced, the power consumption of the air separation device can be reduced, and the combustion removal can be improved by adopting the above process. |